Lull 944E-42 Service Manual - Manual (Page 94)

Transmission
6-8 944E-42
2. Low or no pump flow or
pressure.
1. Low oil level. 1. Fill transmission to correct level
with Mobilfluid 424 ®
(ISO Grade 46). (Refer to
Section 2.4, “Fluid and
Lubricant Capacities.”)
2. Transmission filled with incorrect
oil, or oil contaminated.
2. Drain transmission and fill to
correct level with Mobilfluid 424 ®
(ISO Grade 46). (Refer to
Section 2.4, “Fluid and
Lubricant Capacities.”)
3. Pump suction pipe screen
clogged.
3. Clean, repair and/or replace
suction pipe.
4. Central shaft damaged. 4. Replace central shaft.
5. Pump worn or damaged. 5. Repair or replace pump
assembly.
3. Low clutch pressure. 1. Incorrect oil level. 1. Fill transmission to correct level
with Mobilfluid 424 ®
(ISO Grade 46). Refer to
Section 2.4, “Fluid and
Lubricant Capacities.”
2. Main pressure valve stuck open. 2. Clean the valve spool and
housing.
3. Broken or worn coupling shaft or
piston o-rings.
3. Replace coupling and/or o-rings.
4. Pressure reducing valve stuck
open.
4. Clean the valve spool and
housing.
4. Lack of power. 1. Park or service brake dragging. 1. Refer to Section 8.4, “Hydraulic
Circuits.”
2. Low engine rpm causes
converter stall.
2. Adjust the engine rpm to
specifications. Refer to
Cummins Service Manual.
3. Pump output pressure is low. 3. Refer to Section 6.5.1,
“Transmission Troubleshooting,”
Problem 2. “Low or no pump
flow or pressure.”
4. Clutch discs worn or damaged. 4. Replace clutch discs.
5. Transmission overheating. 5. Refer to Section 6.5.1,
“Transmission Troubleshooting,”
Problem 5. “Transmission
overheating (oil above 248° F
(120° C)).”
6.5.1 Transmission Troubleshooting (Continued)
Problem Cause Remedy